- PRINCIPLE 6: If Opener/Overcaller rebids his suit on the second round, this shows a suit longer than the five cards originally promised.
- A simple rebid — e.g. 1♥ then 2♥ — shows a 6-card suit.
- A jump rebid — e.g. 1♣ then 3♣ — shows a 7-card suit.
- PRINCIPLE 7: No extra values are needed to bid any 4-card suit at the two-level on the second round.
- There is no concept of a 'barrier' or a 'reverse'.
- PRINCIPLE 8: If you have 11-16 HCP and no suit longer than four cards, always open or overcall 1NT, even with a 4-4-4-1 shape.
- 1NT as a response promises the same distributional restrictions but 8-16 HCP.
- PRINCIPLE 9: Simplex is a fundamentally natural bidding system. The only gadgets used are 2♣ Redshift, 4NT Blackwood, and 2NT.
- PRINCIPLE 12: After a suit-raise by partner — e.g. 1♦:2♦, 1♥:3♥, 1♠:4♠, 1♣:5♣ — do not bid on.
- That is, unless the opponents are trying to steal your contract and you have extra suit length beyond the five cards your initial bid promised.
- PRINCIPLE 13: Ignore first-round doubles by the opponents. Carry on and make the bid you would have made if the opponents had passed.
- PRINCIPLE 14: Simplex is designed so that the contract reached is, on most occasions, dealer-independent. That is, if all four players are Simplex bidders, the same contract should be reached, irrespective of who opened the bidding.
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